brotherhood



(No Model.) 2' Sheets-Sheet 1.

P. BROTHERHOOD.

SLIDE VALVE FOR COMPOUND ENGINES.

Patented Sept. 2. 1890.

(No Model.) .2 sh'eets-sheet 2.

P. BROTHERHOOD. SLIDE VALVE FOR COMPOUND ENGINES.

Patented Sept. 2, 1890.

NITED STATES PATENT OFFICE.

PETER BROTHERIIOOD, OF LAMBETH, ENGLAND.

SLIDE-VALVE FOR COMPOUND ENGINES.

SPECIFICATION forming part of Letters Patent No. 435,794, dated September 2, 1890.

Application filed June 25,

1890. Serial No. 356,628. (No model.) Patented in England March 4, 1890,.No. 3,485; in France March4, 1890, No. 204,139; in Belgium March 4, 1890,1l0. 89,699, and in Italy April 1, 1890, L111, 158.

To all whom it may concern: 7

Be it known that 1, PETER BROTHERHOOD, a citizen of England, residing at Belvedere Road, Lambeth, in the county of Surrey, England, have invented an Improvement in Slide- Valves for Compound Engines, (for which I have obtained patents in Great Britain dated March 4:, 1890, No. 3,485; France, dated March 4, 1890, No. 204,139; Belgium, dated March 4,, 1890, No. 89,699, and Italy, dated April 1, 1890, Vol. LIII, 158,) of which the following is a specification.

In an application for patent of even date with the present I have described a construction of slide-valves for steam and other fluidpressure engines, according to which construction I divide the slide-valve into a number of separate parts, each part being a pair of connected pistons governing holes through partitions adjacent to the cylinder-ports. In the specification to the said application I have described several different arrangements showing slide-valves of this kind applied to engines under different conditions, one of these arrangements being for a pair of cylinders of a compound engine. It is to this construction and arrangement of slidevalves for compound engines that my present invention relates.

Figure 1 is a longitudinal, and Fig. 2 is a transverse, section of the cylinder of a compound engine provided with slide-valves according to my invention.

P and Q are the high and low pressure cylinders, placed side by side, with the valves arranged between them. The main slide-rod A passes through a stuffing-box into a chamber H, and is attached to a cross-head B within that chamber. To this cross-head are attached the rods of two slide-valves C for the high-pressure cylinder and the rods of four slide-valves O for the low-pressure cylinder.

It is to be understood, however, that there might be more than two valves 0 and more than four valves 0'. The bodies of the valves 0 and C are tubular, so that the chambers H and H at the ends being always in communication through the slides, there is always the same pressure in both. The ends of the slides are formed as pistons D and E and D and E, fitting holes in partitions inclosing the end ports of the cylinders. The steam for supplying the high-pressure cylinder P enters by the passage F a space K, surrounding the bodies of the slides O, and the exhaustst-eam, after having performed work in the low-pressure cylinder Q, escapes by passage G from the space K surrounding the bodies of the slides C. It will be seen that the lowpressure slide-valves O are somewhat longer than the high-pressure valves 0. As shown in Fig. l, the slide-valves are at the one extreme of their stroke, admitting steam from the space K to the lower port of P, allowing steam to pass from the upper port of P into the chamber 11', and thence to the upper port of Q, and allowing escape of exhaust from the lower port of Q to the space K. hen the slide-valves are moved to the other extreme of their stroke, steam can pass from the space K to the upper port of P, from the lower port of P to the chamber H, and thence to the lower port of Q, while exhaust can pass from the upper port of Q to the space K, The main slide-rod A is moved by a cam-eccentric or other suitable gear in the usual way.

Having thus described the nature of my invention, and the best means I know for carrying the same into practical effect, I claim- For a compound engine having its high and low pressure cylinders placed side by side, partitions separating the ports of each cylinder from their respective supply and exhaust passages and having through them several circular holes, a corresponding number of pairs of connected piston-valves fitting these holes, and all the pairs of piston-valves for both cylinders connected to one cross-head and main slide-rod, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 9th day of June, A. D. 1890.

PETER BROTHERHOOD.

itnesses:

OLIVER IMRAY, Patent Agent, 28 Sonthcmnpton Buildings,

London, W. O.

J NO. P. M. MILLARD, Clerk to llfcssrs. Abel &: Imray, Consulting Engineers and Patent Agents, 28 Southampton Buildings, London, IV. C. 

